The Man Who Turned Blue!
Silver has antibacterial properties and has been used to fight infection for thousands of years, even by Roman soldiers. But it went out of use with the development of antibiotics, which are far more effective. It continued to be used in some over-the-counter medicines until 1999, when the Federal Drug Administration in the US banned it because it causes argyria, which is a result of the silver reacting with light the same way it does in photography. The silver collects in the skin and other organs and does not dissipate. Mr Karson is in good health, but ironically, his dermatitis was not cured by the silver. The condition is not reversible.